Examine source code of Insert Unicode

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.3resigned1",
  "applications": {
    "gecko": {
      "id": "insertunicode@mtalbot.addons.mozilla.org",
      "strict_min_version": "48.0"
    }
  },
  "icons": {
    "32": "icons/insertunicode-32.png",
    "48": "icons/insertunicode-48.png",
    "64": "icons/insertunicode-64.png",
    "96": "icons/insertunicode-96.png"
  },
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "32": "icons/insertunicode-32.png",
      "48": "icons/insertunicode-48.png",
      "64": "icons/insertunicode-64.png",
      "96": "icons/insertunicode-96.png"
    },
    "default_title": "Insert Unicode",
    "default_popup": "pages/popup.html"
  }
}